If you have a Harbor Freight store nearby, they sell various size Pelican knock off cases. Obviously they aren’t the same quality, but should be fine for a spotter and tripod. I bought a Pelican “Vault” case for my Swaro SLC’s at Academy Soprts. They have various sizes also.
Use our Pelican Case Size Guide to find the right size Pelican case for your application. Sorted by smallest to largest, our Pelican Case Size Guide makes it easy to find the right case dimensions.